scaling-helpers-test.c revision 9ad247e8 
1#include <stdlib.h>
2#include <stdio.h>
3#include <assert.h>
4#include "utils.h"
5#include "pixman-inlines.h"
6
7/* A trivial reference implementation for
8 * 'bilinear_pad_repeat_get_scanline_bounds'
9 */
10static void
11bilinear_pad_repeat_get_scanline_bounds_ref (int32_t        source_image_width,
12					     pixman_fixed_t vx_,
13					     pixman_fixed_t unit_x,
14					     int32_t *      left_pad,
15					     int32_t *      left_tz,
16					     int32_t *      width,
17					     int32_t *      right_tz,
18					     int32_t *      right_pad)
19{
20    int w = *width;
21    int64_t vx = vx_;
22    *left_pad = 0;
23    *left_tz = 0;
24    *width = 0;
25    *right_tz = 0;
26    *right_pad = 0;
27    while (--w >= 0)
28    {
29	if (vx < 0)
30	{
31	    if (vx + pixman_fixed_1 < 0)
32		*left_pad += 1;
33	    else
34		*left_tz += 1;
35	}
36	else if (vx + pixman_fixed_1 >= pixman_int_to_fixed (source_image_width))
37	{
38	    if (vx >= pixman_int_to_fixed (source_image_width))
39		*right_pad += 1;
40	    else
41		*right_tz += 1;
42	}
43	else
44	{
45	    *width += 1;
46	}
47	vx += unit_x;
48    }
49}
50
51int
52main (void)
53{
54    int i;
55    for (i = 0; i < 10000; i++)
56    {
57	int32_t left_pad1, left_tz1, width1, right_tz1, right_pad1;
58	int32_t left_pad2, left_tz2, width2, right_tz2, right_pad2;
59	pixman_fixed_t vx = lcg_rand_N(10000 << 16) - (3000 << 16);
60	int32_t width = lcg_rand_N(10000);
61	int32_t source_image_width = lcg_rand_N(10000) + 1;
62	pixman_fixed_t unit_x = lcg_rand_N(10 << 16) + 1;
63	width1 = width2 = width;
64
65	bilinear_pad_repeat_get_scanline_bounds_ref (source_image_width,
66						     vx,
67						     unit_x,
68						     &left_pad1,
69						     &left_tz1,
70						     &width1,
71						     &right_tz1,
72						     &right_pad1);
73
74	bilinear_pad_repeat_get_scanline_bounds (source_image_width,
75						 vx,
76						 unit_x,
77						 &left_pad2,
78						 &left_tz2,
79						 &width2,
80						 &right_tz2,
81						 &right_pad2);
82
83	assert (left_pad1 == left_pad2);
84	assert (left_tz1 == left_tz2);
85	assert (width1 == width2);
86	assert (right_tz1 == right_tz2);
87	assert (right_pad1 == right_pad2);
88    }
89
90    return 0;
91}
92